Space exploration costs a lot of money. Is it really necessary? Up to now, very few astronauts have had chances to visit space. (11)__________ space research has benefited humans in many ways. Satellites in space send information to (12)__________ the daily weather. Communications satellites mean easy and instant contact (13)__________ two people from afar. During the space trips, scientists can (14)__________ more about human bodies. Some scientists even (15)__________ of finding new homes for mankind on another planet.
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